clean up git log aliases

* remove seldom used `git lg` alias
* update colors/format of `git l` alias
* update zsh alias `glog` to use `git l` instead of its own thing

zsh/git.zsh

@@ -11,7 +11,7 @@ alias gsp='git stash pop'
 alias gmv='git mv'
 alias grm='git rm'
 alias grn='git-rename'
-alias glog="git log --graph --pretty=format:'%Cred%h%Creset %an: %s - %Creset %C(yellow)%d%Creset %Cgreen(%cr)%Creset' --abbrev-commit --date=relative"
+alias glog="git l"
 
 # alias git-amend='git commit --amend -C HEAD'
 alias git-undo='git reset --soft HEAD~1'